Add github-actions to set up automated tests

[lcarasik]

This issue needs to be addressed after the issue on making TACOCAT installable: #51

From @veeshy - https://github.com/veeshy:

"Structure looks good for the scope the original article mentioned. Next good steps would be to make the project installable so you can import it from anywhere, pyproject-toml and that would lead nicely into using GitHub-actions to setup automated tests"